How can I repair an "invalid signature" for MRTa and MRTd files? (EtreCheck attached)

Question

EtreCheck version: 2.6.3 (223)Report generated 11/20/15Friday, 10:43 AMRuntime 3:28Download EtreCheck from http://etresoft.com/etrecheckClick the [Click for support] links for help with non-Apple products.Click the [Click for details] links for more information about that line.Hardware Information: (What does this mean?)    MacBook Pro (15-inch, Mid 2012)     [Click for Technical Specifications]    [Click for User Guide]    MacBook Pro - model: MacBookPro9,1    1 2.3 GHz Intel Core i7 CPU: 4-core    4 GB RAM Upgradeable    [Click for upgrade instructions]        BANK 0/DIMM0            2 GB DDR3 1600 MHz ok        BANK 1/DIMM0            2 GB DDR3 1600 MHz ok    Bluetooth: Good - Handoff/Airdrop2 supported    Wireless:  en1: 802.11 a/b/g/n    Battery: Health &#x3D; Normal - Cycle count &#x3D; 964 - SN &#x3D; D862142023YDGDLBJVideo Information: (What does this mean?)    Intel HD Graphics 4000    NVIDIA GeForce GT 650M - VRAM: 512 MB        Color LCD 1440 x 900System Software: (What does this mean?)    OS X El Capitan 10.11.1 (15B42) - Time since boot: less than an hourDisk Information: (What does this mean?)    APPLE HDD HTS545050A7E362 disk0 : (500.11 GB) (Rotational)        EFI (disk0s1) &lt;not mounted&gt; : 210 MB         Recovery HD (disk0s3) &lt;not mounted&gt;  [Recovery]: 650 MB         Macintosh HD (disk1) / : 498.88 GB (248.32 GB free)            Core Storage: disk0s2 499.25 GB Online    MATSHITADVD-R   UJ-8A8   ()USB Information: (What does this mean?)    Apple Inc. FaceTime HD Camera (Built-in)     Apple Inc. Apple Internal Keyboard / Trackpad     Apple Computer, Inc. IR Receiver     Apple Inc. BRCM20702 Hub         Apple Inc. Bluetooth USB Host Controller Thunderbolt Information: (What does this mean?)    Apple Inc. thunderbolt_busGatekeeper: (What does this mean?)    Mac App Store and identified developersKernel Extensions: (What does this mean?)        /System/Library/Extensions    [not loaded]    com.kodak.printer.XXXX.kext (1.3.0) [Click for support]System Launch Agents: (What does this mean?)    [loaded]    com.apple.MRTa.plist - Invalid signature!System Launch Daemons: (What does this mean?)    [loaded]    com.apple.MRTd.plist - Invalid signature!Launch Agents: (What does this mean?)    [running]    com.brother.LOGINserver.plist [Click for support]    [running]    com.fujitsu.pfu.ScanSnap.AOUMonitor.plist [Click for support]    [loaded]    com.google.keystone.agent.plist [Click for support]Launch Daemons: (What does this mean?)    [loaded]    com.adobe.ARMDC.Communicator.plist [Click for support]    [loaded]    com.adobe.ARMDC.SMJobBlessHelper.plist [Click for support]    [loaded]    com.adobe.adobeupdatedaemon.plist [Click for support]    [failed]    com.adobe.agsservice.plist [Click for support]    [loaded]    com.adobe.fpsaud.plist [Click for support]    [loaded]    com.google.keystone.daemon.plist [Click for support]User Launch Agents: (What does this mean?)    [running]    com.amazon.music.plist [Click for support]    [running]    com.google.Chrome.framework.plist [Click for support]    [failed]    com.spotify.webhelper.plist [Click for support] [Click for details]User Login Items: (What does this mean?)    NoneOther Apps: (What does this mean?)    [running]    N4RA379GBW.com.busymac.busycal2.alarm    [running]    com.brother.utility.NETserver.110432    [running]    com.brother.utility.USBserver.118112    [running]    com.etresoft.EtreCheck.208352Internet Plug-ins: (What does this mean?)    o1dbrowserplugin: Version: 5.41.0.0 - SDK 10.8 [Click for support]    Default Browser: Version: 601 - SDK 10.11    Flip4Mac WMV Plugin: Version: 3.2.0.16   - SDK 10.8 [Click for support]    AdobeAAMDetect: Version: 3.0.0.0 - SDK 10.9 [Click for support]    FlashPlayer-10.6: Version: 19.0.0.245 - SDK 10.6 [Click for support]    AdobePDFViewerNPAPI: Version: 15.009.20077 - SDK 10.8 [Click for support]    Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Click for support]    QuickTime Plugin: Version: 7.7.3    Flash Player: Version: 19.0.0.245 - SDK 10.6 [Click for support]    googletalkbrowserplugin: Version: 5.41.0.0 - SDK 10.8 [Click for support]    NP_2020Player_IKEA: Version: 5.0.94.1 - SDK 10.6 [Click for support]    AdobePDFViewer: Version: 15.009.20077 - SDK 10.8 [Click for support]    PepperFlashPlayer: Version: 19.0.0.245 - SDK 10.6 [Click for support]    npDDRia: Version:  0.0.14.1 - SDK 10.9 [Click for support]    SharePointBrowserPlugin: Version: 14.4.6 - SDK 10.6 [Click for support]Safari Extensions: (What does this mean?)    Open in Internet Explorer3rd Party Preference Panes: (What does this mean?)    Flash Player  [Click for support]    Flip4Mac WMV  [Click for support]Time Machine: (What does this mean?)    Skip System Files: NO    Mobile backups: ON    Auto backup: YES    Volumes being backed up:        Macintosh HD: Disk size: 498.88 GB Disk used: 250.56 GB    Destinations:        G-DRIVE Back up II (8:12:15) [Local]         Total size: 999.86 GB         Total number of backups: 19         Oldest backup: 8/12/15Wednesday, 10:33 AM         Last backup: 11/19/15Thursday, 9:52 PM         Size of backup disk: Adequate            Backup size 999.86 GB &gt; (Disk used 250.56 GB X 3)Top Processes by CPU: (What does this mean?)         1%    mds_stores         1%    fontd         0%    WindowServer         0%    mds         0%    SystemUIServerTop Processes by Memory: (What does this mean?)    593 MB    kernel_task    324 MB    ocspd    205 MB    mdworker(14)    90 MB    Finder    78 MB    WindowServerVirtual Memory Information: (What does this mean?)    868 MB    Free RAM     3.15 GB    Used RAM (1.21 GB Cached)    0 B    Swap Used Diagnostics Information: (What does this mean?)    Nov 20, 2015, 10:37:19 AM    Self test - passed    Nov 20, 2015, 10:26:49 AM    /Library/Logs/DiagnosticReports/Finder_2015-11-20-102649_[redacted].hang    Nov 20, 2015, 07:19:21 AM    ~/Library/Logs/DiagnosticReports/Creative Cloud_2015-11-20-071921_[redacted].crash    Nov 20, 2015, 07:09:59 AM    /Library/Logs/DiagnosticReports/Fantastical 2_2015-11-20-070959_[redacted].hang    Nov 20, 2015, 07:08:23 AM    ~/Library/Logs/DiagnosticReports/Creative Cloud_2015-11-20-070823_[redacted].crash    Nov 19, 2015, 11:31:12 PM    ~/Library/Logs/DiagnosticReports/Creative Cloud_2015-11-19-233112_[redacted].crash    Nov 19, 2015, 10:39:12 PM    ~/Library/Logs/DiagnosticReports/Creative Cloud_2015-11-19-223912_[redacted].crash    Nov 19, 2015, 10:08:44 PM    /Library/Logs/DiagnosticReports/Microsoft Word_2015-11-19-220844_[redacted].hang    Nov 19, 2015, 05:51:16 PM    ~/Library/Logs/DiagnosticReports/Creative Cloud_2015-11-19-175116_[redacted].crash    Nov 19, 2015, 05:41:44 PM    /Library/Logs/DiagnosticReports/AdobeAcrobat_2015-11-19-174144_[redacted].hang    Nov 19, 2015, 05:41:37 PM    /Library/Logs/DiagnosticReports/AdobeAcrobat_2015-11-19-174137_[redacted].hang    Nov 19, 2015, 05:33:45 PM    ~/Library/Logs/DiagnosticReports/Creative Cloud_2015-11-19-173345_[redacted].crash    Nov 18, 2015, 11:33:07 PM    /Library/Logs/DiagnosticReports/Microsoft Excel_2015-11-18-233307_[redacted].hang    Nov 18, 2015, 06:48:14 PM    ~/Library/Logs/DiagnosticReports/Creative Cloud_2015-11-18-184814_[redacted].crash    Nov 18, 2015, 12:49:10 PM    /Library/Logs/DiagnosticReports/AdobeCrashDaemon_2015-11-18-124910_[redacted].c rash    Nov 17, 2015, 11:01:58 PM    /Library/Logs/DiagnosticReports/AdobeCrashDaemon_2015-11-17-230158_[redacted].c rash    Nov 17, 2015, 01:15:04 PM    /Library/Logs/DiagnosticReports/AdobeReader_2015-11-17-131504_[redacted].hang

etresoft · Accepted Answer

Hello angelicaheron,Unfortunately, you can&#x27;t fix this. There are a number of Apple programs that have invalid digital signatures. You seem to have run EtreCheck at just the right time to discover new ones. Apparently, one the programs that Apple doesn&#x27;t properly sign is the Malware Removal Tool. I have filed a bug report with Apple. I will also update EtreCheck to hide this failure by default. Thanks for reporting it.